A good forum to visit would be the G503 forum. It has a section for the 2-1/2 ton cargo trucks. You may have a problem these days getting US military goods out of the US, mind you.
The M35Cdn was based on the US M35, but has some pretty unique features. The engine/tranny are the Detroit Diesel 8.2 fuel pincher engine, and the transmission is an Allison. Also, the M35 Cdn has the flat drop side body of the US M35, but with the larger 11.00 X 20" single tires as opposed to the M35's smaller 9.00 X 20 tires with duals on the rear. This makes the Cdn truck sit appreciably higher.
The Canadian winch is a hydraulic type powered by a PTO/pump on the transmission, while the US truck used a PTO with shafts to a mechanical transmission. So while a Canadian winch, along with the frame extension kit, will work on a US M35, the PTO will likely be different, and you would also have to retrofit the oil reservoir, the hoses, and the controls.
The good news is that many MLVWs are now being cannibalized and then sold for reasonable amounts of money. ICAN is the organization that sells off the federal government vehicles, so if you keep an eye on their website, you'll see the MLVWs come up for sale fairly frequently. Seems to me there is even a couple out in the local scrapyard in Brandon, although I can't remember if one of them had the winch outfit.
Personally, I liked the Cdn MLVW. It had it's weaknesses, mainly in the 1950 generation of brakes and powertrain, but it sure beat the heck out of the old M135s. The Allison transmission and the 8.2 engine were a good combination. 25 years later, many of the trucks are still in service with their original engines and transmissions. The truck I operated as a mobile repair team (MRT) before I retired had HLVW bucket seats, a thermostatically controlled auxiliary heater in the cab, the back had enough heat and creature comforts to make army camping fun, and yet had all the tooling and spare parts a guy could want to keep a battery of vehicles in operation.